Focusing hood for photographic cameras



Jan. 15, 1963 R. HVEIDECIKE ETAL' 3, 3,230

FOCUSING HOOD FOR PHOTOGRAPHIC CAMERAS Filed March 25, 1955 4Sheets-Sheet 1 Jan. 15, 1963 R. HAEIDECKE ETAI. 3,073,230

FOCUSING noon FOR PHOTOGRAPHIC CAMERAS Filed Marh 25, 1955 I 4sheets-sheet 2 ,4 Fig.3

f 4 I l o Jan. 15, 1963 R. HEIDECKE ET AL FOCUSING H001) FORPHOTOGRAPHIC CAMERAS Filed March 25, 1955 4 Sheets-Shet 3 Fig. 4

Jan. 15, 1963 R. HEIDECKE ETAI. 3,073,230

FOCUSING HOOD FOR PHOTOGRAPHIC CAMERAS Filed March 25, 1955 4Sheets-Sheet 4 United States Patent 3,073,230 FOCUSING HOOD FORPHOTOGRAPHIC CAMERAS I Reinhold Heidecke, Braunschweig, HermannBretthauer, Klein-Stockheim, near Braunschweig, and Joachim Madge,Braunschweig, Germany, assignors to Franke & Heidecke, FabrikPhotographischer Prazis ions- I Apparate, Braunschweig, Germany, a firmof Germany Original application Mar. 25, 1955, Ser. No. 496,658, nowPatent No; 2,912,912, datedNov. 17, 1959. Divided and this applicationNov. 6, 1959, Ser. No. 851,477

Claims priority, application Germany Apr. 3, 1954 Claims. (Cl. 95-47)The invention relates to a focusing orlight hood for shielding thefocusing or viewing screen of photographic reflex cameras from directlight sources.

An object of this invention is to provide a generall improved and moresatisfactory focusing hood.

Another object is to provide a focusing hood adapted to be collapsedinto a compact unit on the camera housing with one wall of the hoodforming a protective cover for the camera viewing screen and the partsof the focus ing hood itself.

Still another object is to provide a fo-cusing'hood for a photographicreflex camera which is adapted to be disposed in a collapsed position onthe camera housing, with none of the parts of the focusing hood enteringin-to the housing itself.

A further object is to provide a more compact collapsi-- ble focusinghood having a plurality of interconnected walls adapted to be movedconcomitantly into an expanded or collapsed position in a specificsequence as one of the walls of the hood is moved.

A still further object of the invention is to provide a collapsiblefocusing hood having a plurality of Walls acted upon by lost motionconnecting means whereby movement of one wall effects movement of theother walls of the hood in specific and consistent order.

A still further object is to provide a more efficient collapsiblefocusing hood in which the'various walls, when expanded for operation,remain interconnected so that no movement of one wall can occur withoutproducing a like movement of the other walls of the hood.

A still further object is to provide a focusing hood in which the partsmay be adjusted to maintain their desired sequence of movement evenafter 'wear of the parts is manner disclosed as an illustrativeembodiment of the inventionin the following description and in theaccompanying drawings forming 'a part hereof, in which:

FIG. 1 is a perspective view of one embodiment of the focusing orlighthood of the present invention in erected position, with certain ofthe parts being broken awayto illustrate more clearly certain of theconstructional details;

FIG. 2 is a left side elevation of the focusing hood showninFIG. 1,illustrating the partsin a partially collapsed position, with certainparts being broken away or removed;

FIG. 3 is a view similar to FIG.- 2' showing the focusing hood'in itsexpandedtor erected position ready for use;

FIG. 4 is a partial side elevation of another embodiment of theinvention as it appearsin its expanded or erected position ready foruse, and

FIG. 5 is a perspective view of still anotherembodi- 3,073,230 PatentedJan, 15, 1963 The same reference numerals throughout the several viewsindicate the same parts.

In photographic reflex camera constructions, it is common practice toshield the ground glass focusingscreeh of the camera from the directlight rays to permit easier viewing of the image formed thereon. Thefocusingj or light hoods conventionally employed for this purposea-re ofa collapsibleconstruction to protect the focusing screen and parts ofthe hood itself, and to facilitate easier and more compact storage. Oneform of known focusing hood, as for example as shown in the GermanPatent 610,775, issued to Paul Franke et al., is designed to have itsWalls fold upon each other into a compact uniton the top of the cameraitself. However, the sequenceof the collapsing movements of'the separatewalls is often, not exactly established or uniform, so that bendingrorma-r'ring of the walls may result. Further, unless special auxiliarylocking devicesare provided, the side walls of the focusing, hood aresubject to bending or may even be moved into a collapsed position bystrong winds; thus this type of hood has certain limitations in use. I

In another form of known focusing hood, shown by the German Patents616,159 and 637,582, issued to Paul- Franke et al., and the GermanPatent to-Harris, 103,811, each of the side walls of the focusing hoodconsists ofa number of separate sections interconnected by piniand slot:means. With this construction, the parts of the focusing hood are movedinto -a collapsed or expanded position'by movement of one of either ofthe front or rear walls ofv the hood. However, to accommodate thev sidewalls of the hood when collapsed, the camera housing itself rnust' beprovided with suitable cavities, thus requiring a larger camera housingand a generally complicated construction.

In accordance with the present invention, the above noted objections areeliminated, and there is provided afocusing hood which incorporates acompact collapsing arrangement having a cooperating interenga'ged wallstruc ture to facilitate concomitant movement of the walls ofthe hood,When collapsed, the hood is relativeiy 'flat; with all walls lying abovethe ground glass or focusing plate and requiring no wall-receiving slotsat the side" of the focusing plate, this flat relationship ofthe'colljapsed parts being especially advantageous for'rep-lacernent'hoodscarried in stock by camera repair stores, because of the' smallerstorage space required in the stock room.-

With reference to the drawing, the photographic reflex camera itself hasbeen omitted from the drawings, with the exception of its ground glassviewing s'creen, in order to present a clear and simple illustration ofthe focusing hood. The hood is designed to be secured to the-top of thecamera housing, above the ground glass viewing screen 1, by any suitablemeans, and includes a' rectangu lar frame 2 having a front'vertical'wall 3. By means of: a pivot or hinge rod or bar 4, the front wall 5 ofthefocusing hood is pivotallyrnounted on the frame 2.- This wall servesas a cap or cover forthe camera whenthe hood is collapsed, andis'provided along three of its edges with aflange 6 which serves as aweather and"dus't seal I acts upon the wall 5 only as the Wall is'brought almost 4 into its erect or collapsed position. Thus, oncethe-wall 4 is in its erect or collapsed position, the dead center springtends to maintain it in thatparticul ar position.

" The light hood-also includes arear wall 7 pivdtally mounted to theframe 2 by a pivot or hinge rod or bar 8, about which is likewise coileda dead-center type spring (not shown) for maintaining the wall 7 in anerect or collapsed position. To permit concomitant movement of the rearwall 7 as the front wall is moved, a thrust bar or rod '9 is pivoted atone end to the pin 13, carried by the enlarged end portion of the flange24 of the rear wall 7, while the front end of the bar 9 is provided witha pin 10 adapted to ride along the arcuate slot 11, formedconcentrically with the axis of the rod 4. Coiled about the pivot rod 4is a hairpin spring 12, having one of its ends fixed to the front wall5, while its other end reacts against the pin 10, forcing it to the rearend of the slot 11 and moving the thrust bar 9 toward the rear of thehood. The spring 12 exerts a force greater than that of the closingreaction produced by the dead-center type spring acting on the rear wall7 of the focusing hood, thus insuring that the pin 10 will be moved tothe rear end of the slot 11 when the hood is expanded.

The side walls 14 of the focusing hood are connected by pivot or hingerods or bars 18 to the side portions of the frame 2, and are each urgedinto a folded position over the focusing screen 1 by coil springs 19carried by the bars 18, with their end reacting against the frame 2 andthe side walls 14. Approximately centrally of the lower edge of each ofthe side walls 14 is provided an inwardly directed abutment ear or lug20, formed either as a struckout portion from the side wall or aseparate piece adjustably secured thereto. Engaging the lugs 20 are pins21 fixed to the front ends of the arms or levers 22 disposed along theouter surfaces of the side walls 14 and pivotally mounted at their rearends to the hinge rod 8. Stops or abutments 23, carried by the enlargedflange portion of the rear wall 7, engage with the levers 22 as the wall7 is moved into erect position, thereby urging the pins 21 against thelugs 20 and causing the side walls to move upwardly until contact ismade with the flanges 24 of the rear wall. By attaching the lugs 20 tothe side walls 14 as separate elements the user is free to adjust thelugs relative to the pins 21 when needed to maintain the correctsequence of movements of the side walls even after some wear of theparts has been occasioned. To prevent the levers 22 from rattling whenthe focusing hood is in collapsed position, hairpin springs 25, carriedby the pivot bar 8, urge the levers 22 against the stops 23.

In use, the focusing hood assumes a position as shown in FIGS. 1 and 3,wherein the walls are in erect position, with the stop pin 75, extendingoutwardly from the flange 6 of the front wall 5, in engagement with theabutment 76 bent outwardly and upwardly from the main body of the frame2, and with the rear edges of the side walls located inside the sideflanges of the rear wall, to limit the outward swinging movements of theside walls. In collapsing the focusing hood, the front wall 5 is movedrearwardly in the direction of the arrow A. With this movement, thethrust bar 9 moves rearwardly, causing the rear wall to commence itsfolding swing. As the rear wall 7 starts to swing downwardly, the stops23 are carried upwardly away from the levers 22, thus allowing thelevers 22 to move downwardly thereby disengaging their pins 21 from thelugs 20 on the side walls 14. The springs 19 are now free to exert theirclosing movement on the side Walls 14, which are moved into foldedposition before the front or rear wall makes any contact therewith.Continued movement of the front wall 5 in the direction of the arrow A,causes the link to move further rearwardly, thereby continuing thedownward swinging of the rear wall 7 over the now collapsed side walls14, and the front wall 5 goes down on top of the collapsed rear wall 7.During this movement, the spring 12 flexes and allows the pin 10 of thethrust rod 9 to ride along the arcuate slot 11 until the front wall 5 ismoved into a flat covering position, thus providing a lost-motionconnection between the parts. In the collapsed position, the focusinghood forms a compact unit on the top of the camera housing,

with none of the parts of the hood entering into the housing itself.

It will be noted that the various parts of the focusing hood are socorrelated that the specific sequence of movements of the differentwalls of the hood is such that none of the walls interfere with themovement of any of the other walls. In expanding the hood from itscollapsed position the wall 5 is merely moved upwardly about its pivotrod 4, causing the walls to traverse the same paths as above described,but, of course, in a reverse direction and with a reverse sequence.

In the modification of the invention shown in FIG. 4, the wallconstruction of the focusing hood and the sequence of movement isgenerally the same as described above in regard to the first embodiment,with the construction differing primarily in the means for accomplishingthe concomitant and correlated movements of the various parts. The frontwall 27 of this embodiment is pivotally connected to the front end ofthe rectangular frame 2 by a hinge or pivot rod or bar 29, while therear wall 28 is likewise mounted on the opposite end of the frame 2 by apivot or hinge rod or bar 35. As in the first described modification ofthe invention, the front and rear walls 27 and 28 are connected bymotion transmitting links or thrust bars or rods 26 having pins 30 ontheir front ends adapted to ride along the arcuate slots 31 formed inthe side flanges of the front wall, concentrically with the axis of therod 29, while their rear ends are provided with pins 33 movable alongthe slots 34 located in the enlarged portions of the side flanges of therear wall.

The walls 27 and 28 are influenced by conventional dead-center typesprings tending to hold them in either fully erected or fully collapsedpositions, and the thrust rods 26 are urged rearwardly by coil springs3-2 carried by the pivot rod 29 and having their ends reacting againstthe pins 30 and the side flanges of the front wall 27, in the samemanner as in the first embodiment. With the front and rear walls 27 and28, respectively being maintained in their erect positions by theirindiivdual deadcenter springs, the thrust rods 26 are located as shownin FIG. 4, with the pin 30 being located at the rear end of the slot 31,due to the resilient action of the springs 32, and with the pin 33 atthe forward end of its slot 34.

The side walls 41 of the focusing hood are likewise pivotally mounted onthe side portions of the frame 2 by hinge or pivot rods or bars 77, andare constantly urged into a folded position over the ground glassviewing screen of the camera by the springs 42, coiled about the rods 77and reacting against the frame 2 and side walls 41. As in the previouslydescribed construction, an inwardly directed ear or lug 40 is providedapproximately centrally of the lower edge of each side wall. The lugs 40are engaged by pins 39 fixed to the front ends of the arms or levers 38,each of which is pivoted to the hinge bar 35 of the rear wall, and isdisposed outwardly of the side wall 41 against which it reacts. Thelevers \38 correspond in general to the levers 22 of the firstmodification, however in this case movement is imparted to the levers 38by cam pins 36 projecting from the sides of the thrust rods 26 into thecam slots 37 formed in the adjacent surfaces of the levers 38.

Operation of this second form of focusing hood to move it into acollapsed position from its position. shown in FIG. 4 is accomplished bymerely moving the front wall 27 in the direction of the arrow B. Thismovement causes the thrust rods 26 to move rearwardly with their rearpins 33 riding along the slots 34, while their front pins 30- remain inthe position shown in FIG. 4, in view of the force of the springs -32thereagainst. As the thrust rods 26 are urged rearwardly, their pins 36ride along the cam slots 37 of the levers 38, depressing the same andallow ing the springs 42 to swing the side walls 41 toward a foldedposition. It will be noted that the initial movement of the front wall27 merely causes the thrust rod to move rearwardly and allow the sidewalls 41 to collapse,

with 'no' initial movementbeingim'parted to the rear wall 28. At aboutthe same time that the pins 36 of the thrust rods 26 reach the-highpoints of their cam slots 37, so that the arms 38 are fully depressedand the side walls 41 are fully collapsed, the pins 33 reach the rearends of the-slots 34, and then further movement of the front Wall 27 ina closing direction causes the rear wall '28 to swing downwardly overthe side walls 41'. As with the previous modification, the springs32fie'x as the wall '27 is moved closertoward its collapsed position,and allow the pins 30 of'the thrust bars 26 to move relative to thearcuate slots 31 to their forward ends. This form of the invention, whencollapsed, is also'compactly nested on top of the camera housing.

As in the previously described form of the invention, expanding thefocusing hood for use merely requires an upward force on the front wall2.7 about its hinge pin 29, which force is transmitted to the otherwalls of the strucmmby means of the thrust rods 26; The various partsof'the hood will pass through a specific sequence of movement (thereverse of the'movements described above) without any obstruction, andthe hood will once again be in erect position. In this position, theside walls 41 are held against the side flanges of the rear wall 218 bythe engagement of the pins 39 with the lugs 40. The levers 3-8 and thethrust rods 26 are held stationary by the springs 32 and by thedead-center springs reacting against the front and rear walls, and thusall the walls of the housing are operatively connected so that no onewall can be moved without affecting the position of the others.

The embodiment of the invention shown in FIG. 5, V

incorporates many of the principles described above into a differentconstruction in which theside walls of the focusing hood are hinged tothe rear wall rather than to thestationary frame, and fold over eachother against the inside surface of the rear wall.

As'in the structures previously described, the front wall 44- ispivotally mounted on the forward end of the rectangular'frame 2 of thefocusing hood by a pivot or hinge rod or bar 43, while the rear wall 52is likewise mounted on the rear portion of the frame 2 by a pivot orhinge rod orbar 51. The front wall 44 is here again provided with anapproximately right angle flange extending around three of its edges,with similar flanges being formed on the side edges of the rear wall.Suitable dead-center springs are also employed in this form of theinvention to maintain the front and rear walls in their open or closedpositions. .A pair of links or thrustbars 48 are employed to transmitmotion between the front and rear walls. Only oneof such links or thrustbars 48 is shown on the drawing for the sake of clarity and simplicity,it being orba'rs 56 and are each urged into an expandedor out wardposition by coiled'springs 79 carried by the rods 56.

In between the ends of the levers 50 are provided pins or studs 57 whichproject laterally into the slots 58 formed in the side flanges of therear wall 52. Springs 5-9, sup ported on studs projecting laterally fromthe side flanges of the rear wall 52 as shown, constantly tend to urgethe pins 57 forwardly along the slots 58 and thus help to maintain theparts in expanded or operative position.

In use, this form of focusing hood is moved into a collapsed position byswinging the front wall 44 rearwardly about its pivot rod 43, whicheffects a forward pull on the thrust rods 48. The pins 46 of the thrustrods 7 48 are at this time held at the lower ends of the slots 45understood that a thrust bar is positionedalongside of each side walland that both'thrust bars function in a similar manner. However, in thisconstruction thethrust bars are; provided,at their forward ends, withlaterally extending pins 46 which ride along the arcuate grooves orslots 45'formed in the separate lugs or projections 78 3 depending fromand mounted on the forward corners of the front wall. The grooves45 areconcentric with the axis of the rod 43, and the pins 46 are under theinfluence ofsprings 47 carried by pivot rod 43, which tend to 'kecp thepins at those ends of the slots which arethe lower ends whenthe frontwall is erect or the forward ends when the front'wall is collapsed-L Therear ends of the thrust rods 48 are not connected directly to the rearwall 52, but instead are pivotally secured by the studs 49to'intermediateangular levers or links 50, having their lower endsrotatably mounted on the hinge pin 51 of the rear wall. On the free endsof the levers 50 are provided enlarged or nose portions 53 which bearagainst the laterally "projecting ears or lugs 54, formed either asintegral extensions of the side walls 55 or as separate parts"adjustably secured thereto. The side walls of the focusing hood arepivotally mounted on the side edges of the rear wall 52 by pivot orhinge rods by the springs 47, and thus the beginning of downwardswinging of the front wall 44 immediately exerts a forward pull on therods 48, which rocks the intermediate levers 50 forwardly about thepivot rod 51, causing their enlarged portions 53 to engage with the lugs54 and move the side walls 55 toward a folded position as shown in FIG.5. It will be noted that the initial rocking movement of the levers 50imparts no motion to the rearwall 52 since the pins 57 merely slideforwardly along the slots 58 until the side walls 55 approach or are ina folded position. Upon reaching the forward ends of the slots 58, thepins 57 then exert a forward pull on the rear wall 52 as the front wallcontinues its rearward movement, thereby folding it over the focusingscreen I1 after the side walls 55 are in collapsed position over eachother. By making the lugs 54 adjustable relative to their respectiveside walls 55, the user may easily set the lugs so that one of the sidewalls commences its closing movement prior to the other, thus insuringthat no interference results therebetween.

As'with the modifications of inventions heretofore described, thecontinued rearward movement of the front wall 44 causes the springs'47to hex as the rear wall 52 reaches its collapsed location, thus allowingthe pins 46 to move relative to the slots 45 as the front wall 44 movesinto a covering or horizontal position over the rear wall. The sequenceof movements just described with regard to the structure shown in FIG. 5is merely reversed when the front wall 44 is raised to effect expansionof the focusing hood for use.

While the various modifications of the invention described above differin the-manner in which movement is transmitted from the front wall tothe rear and side walls, the means for accomplishing these concomitantmove ments ineach of the structures described may be termed alost-motion transmitting means. In each of the structures presented theinitial movement of the front wall effects a collapsing of the sidewalls, either to a position over.

the viewing screen (FIGS. 1-4) or'parallel to the rear wall' (FIG. 5),while the terminal movement of the front wall draws the rear wall into aflat position, in which it is covered by the front wall; thus there islost motion between'the front wall and the rear wall, although thelatter is operatively connected to the former. Also, the term linkagemeans and similar expressions are intended .to refer to theinterconnecting operating parts in all forms of the invention.

The various hoods described have their walls effectively connected toeach other so that movement of one wall causes the-others to react, inall of the disclosed forms of the invention. In this manner the walls ofthe hood 7 may be collapsed into a compact unit on top of the camera Thedirectional or orienting terms front wall, rear wall, etc., are employedpurely for convenience of description. Obviously the hood may be mountedin any desired position on the camera, and the one wall which controlsthe movements of the other walls could equally well be at the rear, atthe side, or at any other preferred position of orientation.

This application is a division of application Serial No. 496,658, filedMarch 25, 1955 (Patent 2,912,912, granted November 17, 1959).

It is seen from the foregoing disclosure that the above mentionedobjects of the invention are well fulfilled. It is to be understood thatthe foregoing disclosure is given by way of illustrative example only,rather than by way of limitation, and that without departing from theinvention, the details may be varied within the scope of the appendedclaims.

What is claimed is:

1. A focusing hood for use in shielding the focusing screen of aphotographic reflex camera from direct light rays, said hood including abase frame adapted to be secured to the housing of a photographic reflexcamera adjacent to said focusing screen, a plurality of walls carried bysaid base frame, said plurality of walls including first and secondwalls pivotally mounted on opposite sides of said base frame and thirdand fourth walls extending between said first and second walls inlaterally spaced relationship relative to each other, means for mountingsaid third and fourth walls, linkage means interconnecting said firstand second walls for transmitting movement to said second wall as saidfirst wall is moved, said linkage means including actuating meansadapted to move said third and fourth walls in one direction as saidfirst wall is moved in a first direction, said actuating means beinginoperative when said first wall is moved in a second direction,resilient means acting to move said third and fourth walls in adirection opposite to said one direction when said first wall is movedin a second direction, and lost motion connecting means between saidlinkage means and at least one of said first and second walls to permitsaid second wall to move into a collapsed position before said firstwall and after said third and fourth walls have been collapsed and intoan expanded position before said third and fourth walls and after saidfirst wall whereby said plurality of walls move in a specific sequenceas said first wall is moved to expand or collapse the hood, said lostmotion connecting means including a pin on said linkage means adapted tomove along a slot formed in said first wall, and a resilient memberurging said pin and linkage means toward said second wall when saidfocusing hood is in expanded position, said resilient member beingadapted to be tensioned as said second wall approaches its collapsedposition.

2. A fiat-folding collapsible hood structure for a photographic camera,said hood structure comprising a substantially rectanguiar horizontalbase frame, a rear wall, a front wall and two side walls, hinge meansfor mounting said walls for movement between an erected verticalposition and a collapsed position overlying one another, link meansinterconnecting said front and rear walls and having a pin and slotconnection with said front wall, spring means urging said link meanstoward one end of said pin and slot connection, spring means urging saidside walls respectively to one of their said positions, and lever meansoperatively controlled by said link means for urging said side wallsrespectively toward the other of their said positions against the forceof said spring means.

3. A fiat-folding collapsible hood structure for a photographic camera,said hood structure comprising a. sub stantially rectanuglar horizontalframe, a front wall, a rear wall and two side walls all hinged at theirrespective lower edges to four respective sides of said frame to swingfrom a substantially vertical unfolded erected position to asubstantially horizontal folded collapsed position in which one of saidside walls overlaps the other, the rear wall overlies both of the sidewalls, and the front wall overlies the rear wall and constitutes a coverfor the collapsed assembly, first spring means for urging said sidewalls toward their said folded collapsed positions, a pair of links eachhaving a lost motion connection with said front walland interconnectingsaid front and rear walls for movement of said rear wall in response tomovement of said front wall, second spring means for acting on each ofsaid lost motion connections, a pair of levers each pivoted to said baseframe, and means for elevating said levers as said front and rear wallsare unfolded to engage and urge said side walls to said erected positionand for depressing said levers as said front and rear walls are foldedto release said side walls for movement to said collapsed position underactuation of said first spring means.

4. A flat-folding collapsible hood structure for a photographic camera,said hoodstructure comprising a substantially rectangular horizontalframe, a front wall, a rear wall and two side walls all hinged at theirrespective lower edges to four respective sides of said frame to swingfrom a substantially vertical unfolded erected position to asubstantially horizontal folded collapsed position in which one of saidside walls overlaps the other, said rear wall overlies said sidewalls,and said front wall overlies said rear wall and constitutes a cover forthe collapsed assembly, first spring means for urging said side wallstoward their said folded collapsed positions, a pair of links eachinterconnecting said front and rear walls for movement of said rear wallin response to manual movement of said front wall, each of said linkshaving a lost motion connection with said front wall, second springmeans for acting on each of said lost motion connections, a pair oflevers each pivoted to said base frame, apair of lugs each secured tothe lower edge of one of said side walls, and projection means on saidrear wall for engaging and elevating said levers as said rear wall isunfolded to said erected position, whereby said levers engage said lugsto urge said side Walls to said erected position, said projection meansbeing released from said levers assaid rear wall moves to said collapsedposition to release said side walls for movement to said collapsedposition under actuation of said first spring means.

5. A fiat-folding collapsible hood structure for a photographic camera,said hood structure comprising a substantially rectangular horizontalframe, a rear wall, a front wall and two side walls all hinged at theirrespective lower edges to four respective sides of said frame to swingfrom a substantially vertical erected position to a substantiallyhorizontal collapsed position in which one of said side walls overlapsthe other, said rear wall overlies said side walls, and said front walloverlies said rear wall and constitutes a cover for the collapsedassembly, first spring means for urging said side walls toward theirsaid collapsed positions, a pair of links interconnecting said front andrear walls for movement of said rear wall between said positions inresponse to manual movement of said front wall between said positions,said links each having a lost motion connection with said front wall,

second spring means for acting on said lost motion connections, a pairof lugs each secured to the lower edge of one of said side walls, andlever means operatively connected to said links to be elevated therebyas said links are moved by movement of said front wall toward itserected position to engage said lugs and swing said side walls to saiderected position, said lever means being released from said lugs'as saidfront and rear Walls move to said collapsed position to release saidside walls for movement to said collapsed position under actuation ofsaid first spring means.

122,499 Sweden Aug. 17, 1948

1. A FOCUSING HOOD FOR USE IN SHIELDING THE FOCUSING SCREEN OF APHOTOGRAPHIC REFLEX CAMERA FROM DIRECT LIGHT RAYS, SAID HOOD INCLUDING ABASE FRAME ADAPTED TO BE SECURED TO THE HOUSING OF A PHOTOGRAPHIC REFLEXCAMERA ADJACENT TO SAID FOCUSING SCREEN, A PLURALITY OF WALLS CARRIED BYSAID BASE FRAME, SAID PLURALITY OF WALLS INCLUDING FIRST AND SECONDWALLS PIVOTALLY MOUNTED ON OPPOSITE SIDES OF SAID BASE FRAME AND THIRDAND FOURTH WALLS EXTENDING BETWEEN SAID FIRST AND SECOND WALLS INLATERALLY SPACED RELATIONSHIP RELATIVE TO EACH OTHER, MEANS FOR MOUNTINGSAID THIRD AND FOURTH WALLS, LINKAGE MEANS INTERCONNECTING SAID FIRSTAND SECOND WALLS FOR TRANSMITTING MOVEMENT TO SAID SECOND WALL AS SAIDFIRST WALL IS MOVED, SAID LINKAGE MEANS INCLUDING ACTUATING MEANSADAPTED TO MOVE SAID THIRD AND FOURTH WALLS IN ONE DIRECTION AS SAIDFIRST WALL IS MOVED IN A FIRST DIRECTION, SAID ACTUATING MEANS BEINGINOPERATIVE WHEN SAID FIRST WALL IS MOVED IN A SECOND DIRECTION,RESILIENT MEANS ACTING TO MOVE SAID THIRD AND FOURTH WALLS IN ADIRECTION OPPOSITE TO SAID ONE DIRECTION WHEN SAID FIRST WALL IS MOVEDIN A SECOND DIRECTION, AND LOST MOTION CONNECTING MEANS BETWEEN SAIDLINKAGE MEANS AND AT LEAST ONE OF SAID FIRST AND SECOND WALLS TO PERMITSAID SECOND WALL TO MOVE INTO A COLLAPED POSITION BEFORE SAID FIRST WALLAND AFTER SAID THIRD AND FOURTH WALLS HAVE BEEN COLLASPED AND INTO ANEXPANDED POSITION BEFORE SAID THIRD AND FOURTH WALLS AND AFTER SAIDFIRST WALL WHEREBY SAID PLURALITY OF WALLS MOVE IN A SPECIFIC SEQUENCEAS SAID FIRST WALL IS MOVED TO EXPAND OR COLLAPSE THE HOOD, SAID LOSTMOTION CONNECTING MEANS INCLUDING A PIN ON SAID LINKAGE MEANS ADAPTED TOMOVE ALONG A SLOT FORMED IN SAID FIRST WALL, AND A RESILIENT MEMBERURGING SAID PIN AND LINKAGE MEANS TOWARD SAID SECOND WALL WHEN SAIDFOCUSING HOOD IS IN EXPANDED POSITION, SAID RESILIENT MEMBER BEINGADAPTED TO BE TENSIONED AS SAID SECOND WALL APPROACHES ITS COLLAPSEDPOSITION.